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J. TATH'AM. MEDICAL INDUCTION GOIL.

Patehted Aug waximova H OH Mam-- wzm WWWMMQ I UNITED STATES PATENT OFFICE.

JAMES TATHAM, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO- ROBERT H. ENGLE, OF SAME PLACE.

MEDICAL INDUCTION-COIL.

SPECIFICATION forming part of Letters Patent No. 544,266, dated August 6, 1895.

Application filed October 15, 18 91- Serial No. 408,797- (llo model) To ctZZ whom it mag concern.-

Be it known thatl, JAMES TATHAM, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Medical Batteries, of which the following is a specification.

The object of my invention is to so construct an induction-coilesnch as is used in a medical battery-and to so combine a switch therewith that treatment may be effected either with a primary current, with a secondary current, or with a combined current. This object I attain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which- Figure 1 is a representation of an induc: tion-coil, battery, terminals, and switches in accordance with my invention; and Figs. 2 and 3 are views of one of the switches, showin g different adjustments of the same.

A represents the primary battery; B, the induction-coil; D, the switch for putting the primary battery in or cutting it out of circuit; F, the switch for governing the character of the current used in treatment, and G the switch for varying the strength of the secondary or induced current and of the combined current.

One pole of the primary battery is connected by a wire a to a binding-post a, which. is also connected by a wire a to a post a, carrying the screw a which makes and breaks connection with the armature-spring 0., carried by the bar a at the head of the inductioncoil. The other wire I) of the battery passes through the switch D, when the latter is closed, to the binding-post b, which isconnected by a wire 19 to a binding-post d, the latter being connected by a wire (1 to one end of the primary winding w of the inductioncoil. The other end of the primary winding has electrical connection with the bar a. at the end of the coil, and the latter is connected by a wiref to a binding-post f, one end of the secondary winding y being also connected to the wiref.

The secondary winding of the inductioncoil is a multiple-wind-thatis to say, it consistsof a series of independent coils, and between the successive coils are loops represented in the drawings at y g 3 y, each of these loops, and also the terminal wire l] communicating with one of the terminals g of of the switch G, the pivot-stud of which is connected by a wire h with a binding-post h. This post h is connected bya wire h? to a terminal h of the switch F, and the binding-post d is connected by a wire d to another terminal d of said switch, the post f being connected by a wiref to a terminal f of the switch, and said terminal f being connected by a wire f to a fourth terminal f of the switch. The latter has two switch-armst' and m connected by a nonconducting strip n, the pivot-post t" of the arm t' communicating through a wire 1' with one of the treating electrodes, and the pivot-post m of the arm m communicating through awire m with the other of said treating-electrodes.v

The action is as follows, supposing the switch D to be closed: When the switch F is in the position shown in Fig. 1-that is to say, so as to make connection with the terminals 01 f -the treating current is a primary one, the circuit being from the battery A through a'aof-a cflcfiofif'ff f f f it? to oneelectrode, and the return from the other electrode being through m m m d d d b b b to the battery. The current is divided at a a portion passing through the primarywinding ocof the induction-coil, thence through d, 1), b 2) an d b to the battery.

When the switch F is set, as shown in Fig. 2, so as to make connection with the terminals d h the treating current is a secondary current, and the strength of this current is dependent upon the adjustment of the switch G, the movement of which in one direction (to the right in Fig. 1) serves to bring coil after coil of the secondary winding into circuit, while the movement of the switch in the opposite direction throws coil after coil of said secondary winding out of current.

Supposing that the switch is in the position shown in Fig. 2, the secondary circuit will be as follows. From the first or innermost coil y through the primary winding a, thence through d, (1 d (1 t', 'i, and t to one electrode, and on the return from the other electrode through m m m 713 77. 7?. h, switch G and one wire of loop g to the third coil of the secondary winding, thence through loop 3 to [0 electrode through 11 z" 1' 7L3 h2 7t 7t G 1 third coil 1 loop y second coil y, loop y, first coil 11 primary winding 0:, d, cl, Z), and Z) to battery. The secondary current in this case is from the inner end of the first coil of the secr5 ondary winding to f, thence through ff f m m m to one electrode, the return from the other electrode to the first coil of the secondary winding being the same as the primary current. It will thus be seen that of the five 2o binding-postsf isa primary, d a primary sec ondary, h a secondary, and b and a batteryposts, and of the four terminals of the switch F, f and are primaries, 72, a secondary, and (Z a primary secondary.

The core '20 of the coil may, as in ordinary induction-coils, be more or less exposed by sliding out and in the sleeve g, which surrounds said core.

Having thus described my invention, I claim and desire to secure by Letters Patent-- The combination of a batter and an induction coil, with a switch having four points disposed as described, and two arms adjustable so as to bear upon any two adjoining points of said switch, and connections, substantially as described, whereby the current controlled by the switch may be either a primary current, a secondary current, or a com bined primary and secondary current, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

. JAMES ilA'lI-IAM.

Witnesses:

EUGENE ELTERIGII, HARRY SMITH. 

